- Qt 6.9
- Qt Qml
- QML Types
- LoggingCategory
- Qt 6.9.0 Reference Documentation

# LoggingCategory QML Type

Defines a logging category in QML. More...

Import Statement: | `import QtQml`

- List of all members, including inherited members

## Properties

- defaultLogLevel : enumeration
- name : string

## Detailed Description

A logging category can be passed to console.log() and friends as the first argument. If supplied to the logger the LoggingCategory's name will be used as logging category. Otherwise the default logging category will be used.

     import QtQuick

     Item {
         LoggingCategory {
             id: category
             name: "com.qt.category"
             defaultLogLevel: LoggingCategory.Warning
         }

         Component.onCompleted: {
             console.log(category, "log message");
             console.warn(category, "warning message");
         }
     }

By default this outputs only `com.qt.category: warning message`. The `log message` is suppressed due to the defaultLogLevel. You can, however, configure log levels for QML logging categories the same way you can configure them for QLoggingCategory.

Note: As the creation of objects is expensive, it is encouraged to put the needed LoggingCategory definitions into a singleton and import this where needed.

See also QLoggingCategory.

## Property Documentation

defaultLogLevel : enumeration

Holds the default log level of the logging category. By default it is created with the LoggingCategory.Debug log level.

The following enumeration values are available:

- LoggingCategory.Debug
- LoggingCategory.Info
- LoggingCategory.Warning
- LoggingCategory.Critical
- LoggingCategory.Fatal

They mirror the values of the QtMsgType enumeration.

Note: This property needs to be set when declaring the LoggingCategory and cannot be changed later.

See also QtMsgType.

name : string

Holds the name of the logging category.

Note: This property needs to be set when declaring the LoggingCategory and cannot be changed later.

See also QLoggingCategory::categoryName().